This is why we couldn't just interpolate the ArgumentError struct above, or any other struct, or indeed tuples or maps. UTF-8 is capable of encoding all 1,112,064 valid character code points in Unicode using one to four one-byte (8-bit) code units. For anything that doesn't have an obviously meaningful string representation, Elixir wants you to be explicit. Ruby uses utf-8 encoding by default now and utf-8 was specifically designed so that its first codepoints (0-127) are exactly the same as in ASCII encoding. So, quite intentionally, Elixir will not implicitly convert just anything to a string. In Elixir, string interpolation calls the Kernel.to_string/1 macro, which evokes the String.Chars protocol.īy default, it handles strings, atoms (including nil, true, false and module name aliases like String – which are all just atoms behind the scenes), integers, floats, and some lists. If you're interested, you can read all about it in Avdi Grimm's Confident Ruby, or research it online. There is some interesting nuance to Ruby's #to_s, #to_str and Kernel#String, and similar coercion methods for other types. Returns: An array of the Integer ordinals of the characters in str. codepoints.pack ('U') I don't know what you mean by 'only works with UTF-8'. Parameters: Here, str is the given string. hex is a String class method in Ruby which is used to treats the leading characters from the given string as a string of hexadecimal digits (with an optional sign and. NoMethodError : undefined method `to_s' for # codepoints is a String class method in Ruby which is used to return an array of the Integer ordinals of the characters in str.
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